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Unity开发者联盟»论坛 › 3D Answers 技术讨论 › 技术讨论 Technology Answers › 【Unity】URP源码分析(管线篇)
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【Unity】URP源码分析(管线篇)

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发表于 2022-8-23 15:12 | 显示全部楼层 |阅读模式
（基于Unity 2021.3.8、URP 12.1.7）

管线 (Pipeline)

UniversalRenderPipelineAsset.cs

属性


  • Rendering Settings

    • rendererDataList (渲染器数据列表)
    • defaultRendererIndex (默认开启的渲染器索引)
    • requireDepthTexture (是否生成_CameraDepthTexture, 在Shader中使用)
    • requireOpaqueTexture (是否生成_CameraOpaqueTexture, 在Shader中使用)
    • opaqueDownsampling (_CameraOpaqueTexture的降采样倍率)



  • Quality Settings

    • supportsHDR (是否开启HDR)
    • MSAA (_2x、_4x、_8x) (开启2、4、8倍MSAA抗锯齿)
    • renderScale (cameraColorTarget、cameraDepthTarget的分辨率缩放)



  • Lighting Settings

    • mainLightRenderingMode (PerVertex、PerPixel)
    • mainLightShadowsSupported (是否开启主光源阴影)
    • mainLightShadowmapResolution (主光源阴影贴图分辨率)
    • additionalLightsRenderingMode (PerVertex、PerPixel)
    • additionalLightsPerObjectLimit (每个物体接收的最大额外光源数量)
    • additionalLightShadowsSupported (是否开启额外光源阴影)
    • additionalLightsShadowmapResolution (额外光源阴影贴图分辨率)
    • Reflection Probes Settings

      • reflectionProbeBlending (是否开启多个反射探针混合)
      • reflectionProbeBoxProjection (是否开启盒体投影)

    • supportsLightLayers (是否开启光照图层)



  • Shadows Settings

    • shadowDistance (多少距离内生成阴影)
    • shadowCascadeCount (CSM层数)
    • cascade2Split、cascade3Split、cascade4Split (第一二层、二三层、三四层的划分距离)
    • shadowDepthBias (阴影深度偏移值)
    • shadowNormalBias (阴影法线偏移值)
    • softShadowsSupported (是否开启软阴影)



  • Post Processing Settings

    • colorGradingMode (LDR、HDR)



  • Advanced Settings

    • useSRPBatcher (是否开启SRP合批)
    • supportsDynamicBatching (是否开启动态合批)


方法


  • Create (创建UniversalRenderPipelineAsset、UniversalRendererData实例)


UniversalRenderPipeline.cs

属性


  • maxPerObjectLights (每个物体接收的最大光源数量)
  • maxVisibleAdditionalLights (最大可见的额外光源数量, 传入到Shader中的额外光源的信息数组)
  • globalSettings (渲染管线全局设置)
方法


  • Render

    • BeginContextRendering ->
    • BeginFrameRendering ->
    • SetupPerFrameShaderConstants (_GlossyEnvironmentColor、_GlossyEnvironmentCubeMap) ->
    • SortCameras ->
    • For Loop Cameras ->

      • BeginCameraRendering
      • UpdateVolumeFramework (更新Volume后处理参数)
      • InitializeCameraData (初始化CameraData结构体、CreateRenderTextureDescriptor)
      • RenderSingleCamera

        • TryGetCullingParameters
        • renderer.OnPreCullRenderPasses (For Loop rendererFeatures.OnCameraPreCull)
        • context.Cull
        • InitializeRenderingData (GetMainLightIndex、cullResults、cameraData、lightData、shadowData、postProcessingData、perObjectData)
        • renderer.Setup
        • renderer.Execute

      • EndCameraRendering

    • EndFrameRendering ->
    • EndContextRendering



UniversalRenderPipelineCore.cs

属性


  • asset (URP管线资产)
定义


  • RenderingData (CullingResults、CameraData、LightData、ShadowData、PostProcessingData、PerObjectData)
  • ShaderPropertyId (全局Shader属性的ID)
  • ShaderKeywordStrings (全局Shader关键字)


UniversalRenderPipelineGlobalSettings.cs

属性


  • lightLayerNames (光照图层的名称)
  • stripDebugVariants (剔除调试用的变体)
  • stripUnusedPostProcessingVariants (剔除不用到的后处理变体)
  • stripUnusedVariants (剔除不用到的变体)
<hr/><hr/>渲染器 (Renderer)

ScriptableRenderer.cs

属性


  • cameraColorTarget (相机渲染的颜色目标)
  • cameraDepthTarget (相机渲染的深度目标)
  • rendererFeatures (渲染特性列表)
  • activeRenderPassQueue (渲染Pass队列)
方法


  • ScriptableRenderer构造函数 (For Loop rendererFeatures.Create)
  • Setup (抽象函数)
  • Execute

    • InternalStartRendering (For Loop activeRenderPassQueue.OnCameraSetup) ->
    • SetShaderTimeValues (_Time、_SinTime、_CosTime、unity_DeltaTime) ->
    • SortStable (Sort Render Pass) ->
    • SetupLights (虚函数) ->
    • SetPerCameraShaderVariables (_ProjectionParams、_WorldSpaceCameraPos、_ScreenParams、_ScaledScreenParams、_ZBufferParams、unity_OrthoParams、_GlobalMipBias) ->

      • SetCameraMatrices (worldToCameraMatrix、cameraToWorldMatrix、inverseViewMatrix、inverseProjectionMatrix、inverseViewAndProjectionMatrix) ->

    • ExecuteBlock (BeforeRendering、MainRenderingOpaque、MainRenderingTransparent、AfterRendering) ->

      • ExecuteRenderPass (执行每个Block的渲染Pass)

        • renderPass.Configure
        • SetRenderPassAttachments

          • SetRenderTarget (设置RenderPass中所指定的ColorAttachment、DepthAttachment)

        • renderPass.Execute


    • InternalFinishRendering (For Loop activeRenderPassQueue.OnCameraCleanup、activeRenderPassQueue.OnFinishCameraStackRendering)

  • AddRenderPasses (For Loop rendererFeatures.AddRenderPasses)


UniversalRenderer.cs

属性


  • renderingMode (渲染模式, Forward、Deferred)
  • depthPrimingMode (是否开启Depth Prepass)
  • forwardLights (前向渲染光源的处理封装)
  • deferredLights (延迟渲染光源的处理封装)
方法


  • UniversalRenderer构造函数 (初始化渲染Pass、_CameraColorAttachment、_CameraDepthAttachment、_CameraDepthTexture、_CameraNormalsTexture、_CameraOpaqueTexture)
  • Setup

    • forwardLights.ProcessLights (只对Cluster Rendering生效)
    • AddRenderPasses (调用ScriptableRenderer.cs中的)
    • EnqueuePass (渲染Pass添加到渲染队列)
    • CreateCameraRenderTarget (只对Base Camera生效)
    • ConfigureCameraTarget

  • SetupLights (forwardLights.Setup、deferredLights.SetupLights)


ForwardLights.cs

方法


  • Setup (_ADDITIONAL_LIGHTS_VERTEX、_ADDITIONAL_LIGHTS、_CLUSTERED_RENDERING、LIGHTMAP_SHADOW_MIXING、SHADOWS_SHADOWMASK、_MIXED_LIGHTING_SUBTRACTIVE、_REFLECTION_PROBE_BLENDING、_REFLECTION_PROBE_BOX_PROJECTION、_LIGHT_LAYERS)

    • SetupShaderLightConstants (设置光源常量属性)

      • SetupMainLightConstants (_MainLightPosition、_MainLightColor、_MainLightOcclusionProbes、_MainLightLayerMask)
      • SetupAdditionalLightConstants (_AdditionalLightsPosition、_AdditionalLightsColor、_AdditionalLightsAttenuation、_AdditionalLightsSpotDir、_AdditionalLightsOcclusionProbes、_AdditionalLightsLayerMasks、_AdditionalLightsCount)

        • SetupPerObjectLightIndices (去除主光源, 设置物体的额外光源索引)





DeferredLights.cs

属性


  • GbufferAttachments (MRT输出的Gbuffer信息)
方法


  • SetupLights

    • PrecomputeTiles (只对TiledDeferredShading生效, 根据裁剪平面FrustumPlanes生成Tiles)
    • PrecomputeLights (Precompute Punctual Light Data)
    • SetupShaderLightConstants (设置光源常量属性)

      • SetupMainLightConstants (_MainLightPosition、_MainLightColor、_MainLightLayerMask)

    • SortLights (只对TiledDeferredShading生效)
    • CullFinalLights (只对TiledDeferredShading生效)

  • Setup (初始化GbufferAttachments、DepthAttachment)
  • ExecuteDeferredPass

    • SetupMatrixConstants (_ScreenToWorld)
    • RenderStencilLights

      • RenderStencilDirectionalLights (FullscreenMesh)
      • RenderStencilPointLights (SphereMesh)
      • RenderStencilSpotLights (HemisphereMesh)

    • RenderTileLights (只对TiledDeferredShading生效)
    • RenderFog



ScriptableRendererData.cs

属性


  • rendererFeatures (渲染特性列表)


UniversalRendererData.cs

属性


  • shaders (内置Shader/Utils目录下的着色器资源)
  • opaqueLayerMask、transparentLayerMask (不透明、半透明物体的层遮罩)
  • defaultStencilState (默认模板测试状态)
  • renderingMode (渲染模式, Forward、Deferred)
  • depthPrimingMode (是否开启Depth Prepass)
<hr/><hr/>渲染特性 (Renderer Feature)

ScriptableRendererFeature.cs


  • Create (抽象函数)
  • OnCameraPreCull (虚函数)
  • AddRenderPasses (抽象函数)
  • Dispose (虚函数)


RenderObjects.cs


  • RenderObjectsPass

    • SetDetphState (设置深度缓冲区状态)
    • SetStencilState (设置模板测试状态)

  • RenderObjectsSettings

    • renderPassEvent (渲染Pass的执行时机事件)
    • overrideMaterial (覆盖的材质)
    • overrideMaterialPassIndex (覆盖材质的Pass索引)
    • depthCompareFunction (深度比较方式)
    • enableWrite (深度是否写入)
    • filterSettings

      • renderQueueType (渲染队列)
      • layerMask (层遮罩)
      • passNames (光照模式LightMode)

    • stencilSettings

      • stencilReference (模板引用值)
      • stencilCompareFunction (模板比较方式)
      • passOperation (模板值通过后的操作)
      • failOperation (模板值失败后的操作)
      • zFailOperation (深度比较失败后的操作)

    • cameraSettings

      • offset (相机位置偏移)
      • cameraFieldOfView (视野FOV)




DecalRendererFeature.cs


  • DecalGBufferRenderPass (执行Shader中LightMode为DecalGBufferMesh的Pass, 从GBuffer深度重建世界坐标, Shader实现可参考ShaderPassDecal.hlsl)
  • DBufferRenderPass (执行Shader中LightMode为DBufferMesh的Pass, 将贴花固有色, 法线, 金属度、光滑度、AO、自发光渲染到DBuffer的_DBUFFER_MRT1、_DBUFFER_MRT2、_DBUFFER_MRT3, 正常渲染时采样_DBufferTexture使用DBuffer数据覆盖SurfaceData, Shader实现可参考ShaderPassDecal.hlsl、DBuffer.hlsl)
  • DecalScreenSpaceRenderPass (执行Shader中LightMode为DecalScreenSpaceMesh的Pass, 从深度重建世界坐标、法线, Shader实现可参考ShaderPassDecal.hlsl)


ScreenSpaceAmbientOcclusion.cs


  • ScreenSpaceAmbientOcclusionPass (生成_ScreenSpaceOcclusionTexture, Shader实现可参考SSAO.hlsl)


ScreenSpaceShadows.cs


  • ScreenSpaceShadowsPass (根据深度、_MainLightShadowmapTexture生成_ScreenSpaceShadowmapTexture, 设置关键字_MAIN_LIGHT_SHADOWS_SCREEN)
<hr/><hr/>
渲染目标 (Render Target)

RenderTargetHandle.cs


  • int类型id、RenderTargetIdentifier类型rtid的封装, Init时调用Shader.PropertyToID绑定id


RenderTargetBufferSystem.cs


  • frontBuffer和backBuffer双缓冲的封装
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